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Power Control for UL MU Date: 2016-03-14 Authors: March 2016
Month Year doc.: IEEE yy/xxxxr0 March 2016 Power Control for UL MU Date: Authors: Name Affiliation Address Phone Arjun Bharadwaj Qualcomm 5775 Morehouse Dr. San Diego, CA, USA Bin Tian Youhan Kim 1700 Technology Drive San Jose, CA 95110, USA Sameer Vermani Arjun Bharadwaj, Qualcomm, et. al. John Doe, Some Company
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Authors (continued) March 2016 Alice Chen Albert Van Zelst
Name Affiliation Address Phone Alice Chen Qualcomm 5775 Morehouse Dr. San Diego, CA, USA Albert Van Zelst Straatweg 66-S Breukelen, 3621 BR Netherlands Alfred Asterjadhi Carlos Aldana 1700 Technology Drive San Jose, CA 95110, USA George Cherian Gwendolyn Barriac Hemanth Sampath Lin Yang Menzo Wentink Naveen Kakani 2100 Lakeside Boulevard Suite 475, Richardson TX 75082, USA Raja Banerjea 1060 Rincon Circle San Jose CA 95131, USA Richard Van Nee Rolf De Vegt Simone Merlin Tevfik Yucek VK Jones Arjun Bharadwaj, Qualcomm, et. al.
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2111 NE 25th Ave, Hillsboro OR 97124, USA
March 2016 Authors (continued) Name Affiliation Address Phone Ron Porat Broadcom Sriram Venkateswaran Matthew Fischer Zhou Lan Leo Montreuil Andrew Blanksby Vinko Erceg Mingyue Ji Robert Stacey Intel 2111 NE 25th Ave, Hillsboro OR 97124, USA Shahrnaz Azizi Po-Kai Huang Qinghua Li Xiaogang Chen Chitto Ghosh Laurent Cariou Yaron Alpert Assaf Gurevitz Ilan Sutskover Arjun Bharadwaj, Qualcomm, et. al.
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Authors (continued) March 2016 Hongyuan Zhang Marvell
Name Affiliation Address Phone Hongyuan Zhang Marvell 5488 Marvell Lane, Santa Clara, CA, 95054 Yakun Sun Lei Wang Liwen Chu Jinjing Jiang Yan Zhang Rui Cao Sudhir Srinivasa Bo Yu Saga Tamhane Mao Yu Xiayu Zheng Christian Berger Niranjan Grandhe Hui-Ling Lou Arjun Bharadwaj, Qualcomm, et. al.
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Authors (continued) March 2016 Jianhan Liu Mediatek USA
Name Affiliation Address Phone Jianhan Liu Mediatek USA 2860 Junction Ave, San Jose, CA 95134, USA Thomas Pare ChaoChun Wang James Wang Tianyu Wu Russell Huang James Yee No. 1 Dusing 1st Road, Hsinchu, Taiwan Alan Jauh Frank Hsu Joonsuk Kim Apple Aon Mujtaba Guoqing Li Eric Wong Chris Hartman Arjun Bharadwaj, Qualcomm, et. al.
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Authors (continued) March 2016 David X. Yang Jiayin Zhang Jun Luo
Name Affiliation Address Phone David X. Yang Huawei F1-17, Huawei Base, Bantian, Shenzhen Jiayin Zhang 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai Jun Luo Yi Luo Yingpei Lin Jiyong Pang Zhigang Rong 10180 Telesis Court, Suite 365, San Diego, CA NA Jian Yu Ming Gan Yunsong Yang Junghoon Suh 303 Terry Fox, Suite 400 Kanata, Ottawa, Canada Peter Loc Edward Au Teyan Chen Yunbo Li Arjun Bharadwaj, Qualcomm, et. al.
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Authors (continued) March 2016 Jinmin Kim LG Electronics
Name Affiliation Address Phone Jinmin Kim LG Electronics 19, Yangjae-daero 11gil, Seocho-gu, Seoul , Korea Kiseon Ryu Jinyoung Chun Jinsoo Choi Jeongki Kim Dongguk Lim Suhwook Kim Eunsung Park JayH Park HanGyu Cho Thomas Derham Orange Bo Sun ZTE #9 Wuxingduan, Xifeng Rd., Xi'an, China Kaiying Lv Yonggang Fang Ke Yao Weimin Xing Brian Hart Cisco Systems 170 W Tasman Dr, San Jose, CA 95134 Pooya Monajemi Arjun Bharadwaj, Qualcomm, et. al.
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Authors (continued) March 2016 Fei Tong Samsung Hyunjeong Kang
Name Affiliation Address Phone Fei Tong Samsung Innovation Park, Cambridge CB4 0DS (U.K.) Hyunjeong Kang Maetan 3-dong; Yongtong-Gu Suwon; South Korea Kaushik Josiam 1301, E. Lookout Dr, Richardson TX 75070 (972) Mark Rison Rakesh Taori (972) Sanghyun Chang Yasushi Takatori NTT 1-1 Hikari-no-oka, Yokosuka, Kanagawa Japan Yasuhiko Inoue Shoko Shinohara Yusuke Asai Koichi Ishihara Junichi Iwatani Akira Yamada NTT DOCOMO 3-6, Hikarinooka, Yokosuka-shi, Kanagawa, , Japan 3759 Arjun Bharadwaj, Qualcomm, et. al.
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Authors (continued) March 2016 Arjun Bharadwaj, Qualcomm, et. al. Name
Affiliation Address Phone Masahito Mori Sony Corp. Yusuke Tanaka Yuichi Morioka Kazuyuki Sakoda William Carney Tomoko Adachi Toshiba Narendar Madhavan Kentaro Taniguchi Toshihisa Nabetani Tsuguhide Aoki Koji Horisaki David Halls Filippo Tosato Zubeir Bocus Fengming Cao Parag Kulkarni Arjun Bharadwaj, Qualcomm, et. al.
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Authors (continued) March 2016 Arjun Bharadwaj, Qualcomm, et. al.
Minho Cheong Newracom, Inc. 9008 Research Dr, Irvine, CA 92618 Reza Hedayat Young Hoon Kwon Yongho Seok Daewon Lee Yujin Noh Sigurd Schelstraete Quantenna 3450 W. Warren Ave, Fremont, CA 94538 Huizhao Wang Arjun Bharadwaj, Qualcomm, et. al.
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March 2016 Introduction Power control is required for UL OFDMA and MU-MIMO transmissions in 11ax To manage interference between users and from OBSS OFDMA: Ensure that interference between adjacent RUs are within tolerable limits MU-MIMO: Manage power imbalance between different streams Ensure AP Rx dynamic range is not exceeded Requirements for UL MU transmission were proposed in [1] However, relative Tx accuracy requirements were not introduced Relative Tx accuracy requirements ensure that that changes to the Tx power between UL transmissions are within specified limits In this contribution, Principles of power control are outlined and a signaling scheme to support the PC algorithm is proposed Requirements for relative Tx power accuracy are proposed Arjun Bharadwaj, Qualcomm, et. al.
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Principles of Power Control
March 2016 Principles of Power Control STAs need to transmit with enough power to ensure adequate SNR at the AP for their assigned MCS Higher than needed transmit power levels may cause unnecessary interference to other users Especially true for low MCS transmissions with loose EVM requirements Promotes spatial reuse and also limits interference to OBSS AP selects the Rx power required for each STA corresponding to the assigned MCS Enables the AP to adapt to different channel conditions for both SU and MU-MIMO transmissions Can also account for any bias due to measurement errors or Tx power inaccuracies We propose to add signaling to support the above in the next slide Arjun Bharadwaj, Qualcomm, et. al.
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Proposed Power Control Mechanism
March 2016 Proposed Power Control Mechanism AP signals the following in the Trigger frame that schedules the UL MU transmission AP Tx Power: 𝑇𝑥 𝑝𝑤𝑟 𝐴𝑃 (𝑑𝐵𝑚) Required Rx power: 𝑇𝑎𝑟𝑔𝑒 𝑡 𝑅𝑆𝑆𝐼 (𝑑𝐵𝑚) for each STA that is scheduled in the Trigger frame STA sets its Tx power per the following equation 𝑇𝑥 𝑝𝑤𝑟 𝑆𝑇𝐴 𝑑𝐵𝑚 = 𝑃𝐿 𝐷𝐿 𝑑𝐵 +𝑇𝑎𝑟𝑔𝑒 𝑡 𝑅𝑆𝑆𝐼 (𝑑𝐵𝑚) where 𝑃𝐿 𝐷𝐿 (𝑑𝐵) is the DL path loss computed by the STA based on AP transmit power signaled in the Trigger message and Measured RSSI of the Trigger message 𝑇𝑎𝑟𝑔𝑒 𝑡 𝑅𝑆𝑆𝐼 (𝑑𝐵𝑚) is signaled by the AP in the trigger message Arjun Bharadwaj, Qualcomm, et. al.
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March 2016 Signaling from STA AP AP needs to be aware of the available Tx power at the STA To select appropriate MCS levels for each STA and optimize performance Propose to signal STA headroom to the AP in UL transmissions Details of the STA’s headroom definition are TBD Arjun Bharadwaj, Qualcomm, et. al.
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Summary of Power Control
March 2016 Summary of Power Control AP signals the following through the trigger message AP Tx Power (dBm) Target RSSI (dBm) and MCS for each STA scheduled for UL MU transmission STA autonomously sets its Tx power based on Computed Path Loss Based on AP transmit power and measured RSSI of trigger Target RSSI signaled by the AP STA signals its headroom on the UL Arjun Bharadwaj, Qualcomm, et. al.
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Relative Tx Power Accuracy Requirement
March 2016 Relative Tx Power Accuracy Requirement Requirement pertains to the accuracy of adjusting Tx power between consecutive UL transmissions Ensures that Tx power adjustments by the STA do not exceed specified limits Tx power adjustment from one transmission to the next can be more accurate than setting an absolute value Requirement mainly applies to the Class B: Low capability devices Class A devices already have a tight absolute Tx power requirement (+/-3dB) We propose a relative Tx power requirement of +/- 3dB for Class B devices Applicable for Tx power level changes within the STA’s dynamic range Arjun Bharadwaj, Qualcomm, et. al.
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March 2016 Straw Poll 1 Do you agree to add the following power control mechanism for UL MU transmissions to the SFD? AP signals the following in the Trigger frame that schedules the UL MU transmission In the common info field: AP Tx Power: 𝑇𝑥 𝑝𝑤𝑟 𝐴𝑃 (𝑑𝐵𝑚) In the per user info field: 𝑇𝑎𝑟𝑔𝑒 𝑡 𝑅𝑆𝑆𝐼 (𝑑𝐵𝑚) for each STA that is scheduled in the Trigger frame The number of bits in the Target RSSI is TBD STA sets its Tx power per the following equation 𝑇𝑥 𝑝𝑤𝑟 𝑆𝑇𝐴 𝑑𝐵𝑚 = 𝑃𝐿 𝐷𝐿 𝑑𝐵 +𝑇𝑎𝑟𝑔𝑒 𝑡 𝑅𝑆𝑆𝐼 (𝑑𝐵𝑚) where 𝑃𝐿 𝐷𝐿 (𝑑𝐵) is the DL path loss computed by the STA based on the AP transmit power signaled in the Trigger message and the measured RSSI of the Trigger message 𝑇𝑎𝑟𝑔𝑒 𝑡 𝑅𝑆𝑆𝐼 (𝑑𝐵𝑚) is signaled by the AP in the trigger message Arjun Bharadwaj, Qualcomm, et. al.
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Straw Poll 2 Do you agree to add the following text to the SFD?
March 2016 Straw Poll 2 Do you agree to add the following text to the SFD? STAs that participate in HE trigger-based PPDU transmit the power headroom in triggered UL MU transmissions to assist in the AP’s MCS selection Details of STA headroom definition are TBD Bin Tian, Qualcomm
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Straw Poll 3 Do you agree to add the following text to the SFD?
March 2016 Straw Poll 3 Do you agree to add the following text to the SFD? STAs that participate in HE trigger-based PPDU shall support +/-3dB Relative Tx power requirements for Class B devices. Relative Tx power accuracy is defined as the accuracy of the change of the transmit power in consecutive UL MU transmissions Bin Tian, Qualcomm
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